Function            diskchanged - has the disk has been changed

  Syntax              boolean diskchanged(int drive);

  Prototype in        ibm.h

  Remarks             diskchanged determines if the disk has been changed
                      since the last access via INT 0x13, Function 0x16.
                      The drive parameter corresponds to the drive
                      letter, 0 = A:, 1 = B:, etc.

  Return value        returns TRUE if the disk has been changd since the
                      last access and FALSE otherwise.

  Note                This function valid only on AT, XT2, XT286,
                      Convertible and PS/2.

  See also            disktype()